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It is ten o'clock at night and you are outside. You can see many stars in the sky. Each star is another sun. The sky is big, and it hag many suns.
Our sun is near to us. It warms us and gives us light in daytime. The stars are not near. We can see their light only at night, and they do not warm us.
The stars are not all the same. Many stars are quite like our sun. They are the same size, and they have the same colour, yellow. Other stars are bigger or smaller. A “giant(巨人)” star is very, very big. A “dwarf(侏儒)”is a small star—smaller than the sun.
Stars have different colours, too. They can be blue, orange, yellow, white or red. There are giants and dwarfs in all these colours. All stars are, of course, very hot. The hottest stars are the blue ones. White stars come next, they are less hot. Then yellow and orange stars are less hot again. Red stars are the least hot, and they are also the oldest stars.
Light moves very quickly across the sky, eighteen million (18,000,000)kilometers in a minute. Our nearest star is a red dwarf. Its name is Proxima Centauri ( proxima ＝ nearest), and it gives a weak, red light. We can just see this light. It left Proxima Centauri 4.25 years ago, and now tonight, it is reaching cur eyes. Think about it! In one minute, 18,000,000 kilometres. So, in 4.25 years—well, how many kilometers? You can find the answer yourself.
I will just say this: Proxima Centauri is a long way from us.
1．According to the temperatures on stars, the right order from the lowest temperature to the highest is ________.
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A．red→yellow→white→blue
B．orange→red→blue→white
C．blue→white→yellow→red
D．white→blue→orange→red
2．All the following am right except ________.
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A．a “dwarf” is smaller than the sun
B．there are dwarfs in different colours
C．a “dwarf” is a small star
D．dwarfs are the least hot
3．How far away is the star Proxima Centauri from us?
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A．40,208,400,000,000 kilometres.
B．9,460,800,000,000 kilometres.
C．679,140,000,000 kilometres .
D．279,225,000,000 kilometres .
4．When we say “The star Procyon is ‘ten light years’ away.”, we mean ________.
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A．we can reach the star in ten years
B．we first saw the star ten years ago
C．the light left Procyon ten years ago
D．Procyon has been that far away for ten years
查看习题详情和答案>>People have been painting pictures for at least 30,000 years. The earliest pictures were painted by people who hunted animals. They used to paint pictures of the animals they wanted to catch and kill. Pictures of this kind have been found on the walls of caves in France and Spain. No one knows why they were painted there. Perhaps the painters thought that their pictures would help them to catch these animals. Or perhaps human beings have always wanted to tell stories according to pictures.
About 5,000 years ago, the Egyptians and other people in the Near East began to use pictures as kind of writing. They drew simple pictures or signs to represent things and ideas, and also to represent the sounds of their language. The signs these people used became a kind of alphabet.
The Egyptians used to record information and to tell stories by putting picture writing and pictures together. When an important person died, scenes and stories from his life were painted and carved on the walls of the place where he was buried. Some of these pictures are like modern comic strip stories. It has been said that Egypt is the home of the comic strip. But, for the Egyptians, pictures still had magic power. So they did not try to make their way of writing simple. The ordinary people could not understand it.
By the year 1,000 BC, people who lived in the area around the Mediterranean Sea had developed a simpler system of writing. The signs they used were very easy to write, and there were fewer of them than in the Egyptian system. This was because each sign, or letter, represented only one sound in their language. The Greeks developed this system and formed the letters of the Greek alphabet. The Romans copied the idea, and the Roman alphabet is now used all over the world.
These days, we can write down a story, or record information, without using pictures. But we still need pictures of all kinds: drawing, photographs, signs and diagrams. We find them everywhere: in books and newspapers, in the street, and on the walls of the places where we live and work. Pictures help us to understand and remember things more easily, and they can make a story much more interesting.
1.Pictures of animals were painted on the walls of caves in France and Spain because______.
A. the hunters wanted to see the pictures
B. the painters were animal lovers
C. the painters wanted to show imagination
D. the pictures were thought to be helpful
2.The Greek alphabet was simpler than the Egyptian system for all the following reasons EXCEPT that______.
A. the former was easy to write
B. there were fewer signs in the former
C. the former was easy to pronounce
D. each sign stood for only one sound
3.Which of the following statements is TRUE?
A. The Egyptian signs later became a particular alphabet.
B. The Egyptians liked to write comic strip stories.
C. The Roman alphabet was developed from the Egyptian one.
D. The Greeks copied their writing system from the Egyptians.
4. In the last paragraph, the author thinks that pictures ______.
A. should be made comprehensible
B. should be made interesting
C. are of much use in our life
D. have disappeared from our life
查看习题详情和答案>>
Word came that the government must control the spread of this disease.
“Our job，”said the 26 officer，“is to spray the wall of every house in every town and village in the malaria parts of Mexico.You may be 27 to learn that there are about ninety-nine thousand 28 villages and towns.Some are big places like the capital city， 29 are single houses deep in the forest or upon the mountaintops.The men working with our program say that most of these people 30 within districts which are 31 enough for the mala ria-carrying mosquitoes to live in and spread the disease.That 32 that we must plan to spray the bricks of 33 three million houses once or twice a year for five years.”
“We have 34 everything very carefully，”said the officer 35 .“Our advance guards have drawn 36 of some forty thousand parts of the country for 37 by the spray teams.Each house in the malaria districts has been given a special 38 so that we can work in order.The United States has given us cars and trucks to carry the spray teams and their 39 .”
“The malaria program has been 40 with the people in this country.Everyone wants to 41 .The Defense Department is helping us plan the 42 of men and supplies.The Education Department has printed sheets in Spanish to explain 43 malaria is spread.Resistance is a problem.It was in the neighboring country—the United States that such resistance to spray was first 44 .Take the 45 of the housefly and D.D.T. At fist D.D.T. killed them off.Now it won’t hurt a fly.”
“What worries people is the danger that the mosquitoes may become resistant，”said the officer at last.
26.A.education B.wealth C.health D.medicine
27.A.surprised B.excited C.doubtful D.happy
28.A.united B.developing C.similar D.separate
29.A.other B.some C.the others D.the few
30.A.sleep B.live C.stand D.sit
31.A.cold B.hot C.bright D.warm
32.A.saves B.expresses C.means D.is
33.A.nearly B.mostly C.finally D.only
34.A.read B.learnt C.written D.studied
35.A.mentioned B.remembered C.started D.continued
36.A.pictures B.places C.maps D.bus-lines
37.A.store B.use C.share D.show
38.A.name B.sign C.number D.attention
39.A.tools B.clothes C.families D.guns
40.A.familiar B.friendly C.strict D.popular
41.A.work B.run C.stop D.help
42.A.movement B.program C.action D.equipment
43.A.why B.how C.what D.that
44.A.proved B.killed C.thought D.discussed
45.A.event B.matter C.fact D.case
查看习题详情和答案>>完形填空
Can you imagine what life would be like if there were not 1 ？You could not call 2 your friends on the phone and talk to them．If fire 3 out in your house you could not 4 the fire department．If somebody were 5 ，you could not call a 6 ．
In our daily life we need to communicate with 7 ．We do this 8 by speaking to other people and listening to 9 they have to say to us，and when we are 10 to them we can do this very 11 ．However，our 12 will not travel very far even when we 13 ，and it is thanks to the 14 of the telephone that we are 15 able to communicate with each other Cleary 16 we were in the 17 boat．
The man who 18 this possible was Alexander Graham．a Scotsman．born in Edin-burgh in 1847． Bell，a teacher of visible speech who later moved to Canada． 19 all his spare time experimenting． 20 enthusiastic（热情的）was he in his research for a means for sending speech by electricity that he left little time for his day-to-day work and at one time was almost penniless．
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根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项多余选项。
Everyone knows English is one of the most important subjects in middle schools．And we always know learning English is very important, but few students know how to learn English well． 1
I think if we have a right way to learn English, and we work hard, then we must learn English well．But what is the right way? 2 Second, everyone knows remem bering new words is important, but how to remember them? I think we can copy new words on pieces of paper．and take them with us．When we are free, we can read them．Third, how to improve our listening and speaking? 3 And we can answer the questions in the class, don't he afraid of making mistakes．I think it's useful to us．Finally, it's about reading and writing． 4 And try our best to retell it, we can also keep a diary every day, and spend an hour practicing English．
5 lf necessary, we can turn to our classmates and teachers for help instead of giving up．If we don't study hard, it's difficult to learn English well．
A．We can sing English songs, listen to the radio and listen to tapes every day．
B．Then how can we make rapid progress and learn English well?
C．Whenever we meet difficulties in our English study, we shouldn't lose heart．
D．To begin with, you can recite as many words as you can．
E．First, we must he confident enough to learn English and be interested in it．
F．In a word, we will make rapid progress．
G．When we are free, we can read articles in English．